Thank you for your question.
Blast cells and myelocytes are immature cells of the white blood cell
series. So when one's white cell count is high like yours is, it means that either this is an infection or something else that is causing your white blood cells to be high.
Since your bone marrow
is producing a lot of cells it also sometimes causes immature white blood cells to also come into the blood like in your case.
This is not something to worry about a great deal.